Good morning. I recently developed an high end driver closed loop/ servo board based on tmc4671 with absolute 16bit magnetic encoder, full foc field of control , Velocity Control, Position Control, torque control with canbus and usb connection plus Application SPI + Debug (UART, SPI). It can de…

[image] clrobotix: two micrometric linear encoders (X/Y) Measuring from where to where? There is no reliable “datum” axes to measure from. The bed shakes, the printer frame deflects and oscillate, belt tension causes racking in the gantry etc. Yes a piezo actuator could correct the nozzle l…

you are right. It may be a better way to use just an accelerometer. and a voice coil actuator istead of piezo. also I should intercept the step/dir signal to calculate the teorical acceleration. with accelerometer I can get the sum of all oscillations

Random idea (this would need some testing to verify). Is the positional lag predictable? Like if you tell the X-axis to move to 100mm (assume cartesian kinematics), how long after the move completes would the encoder register the X-axis to be at 100mm? If this positional lag is predictable and consi…

[image] clrobotix: accelerometer I can get the sum of all oscillations 2 accelerometers actually (unless you want to epoxy your heated bed to a 2000kg block of granite). 6 axis IMU on the build surface and a 2 axis on the print head. Then all you have to do is track the location of the axis …

There’s no need to feed the Gcode in, unless you’re trying to duplicate the look ahead functionality Klipper already has. Just use the step and direction signals. As I said, what you’re looking for already exists. Just not that integrated into Klipper. The Magneto X uses linear encoders on the ra…

Closed loop it employed to wash out backlash and hysteresis NOT deflection and resonance. Closed loop control CANNOT predict positional errors. Until errors are of a magnitude sufficient to be measured then and only then can the correction be made. Rigidity is what gives a milling machine the abil…

Going through this, there’s two parts. Using closed loop control for the extruder, and using it for the motion system. I’ll address the specifics of the Magneto X below, but will start with generalities and why I think what @clrobotix is working on is useful for all printers. For the motion syste…

My big printer is fixed on the cement wall and cement floor. the cement is 50 cm. the printer structure is rigid. optical it may be the way. [image] cardoc: I spent a couple days modeling an optical motion capture system. Concept was an IR point source offset 25mm from the nozzle and 8 line sen…

[image] EmperorArthur: Focusing on the extruder, that’s where I see the most potential gain from something like the board above. The TMC 4671 means a slight imperfection of the filament can be handled by a temporary increase in current. This saves weight and increases reliability. Especially for…

[image] clrobotix: what kind of sensor is 1x1024? There is a whole class of ccd “line sensors”. put a lens in front and it becomes a camera with a 1 pixel high image. The 4k I was considering: https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/TCD1304DG-8Z-K/1657268…

New open source high end closed loop driver klipper compatible

General Discussion

clrobotix March 12, 2026, 7:05pm 55

Hello. The boards are currently under heavy load test. When the boards are fully tested and ready for production I’ll post everything here.

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New open source high end closed loop driver klipper compatible

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